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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7757f7c32e87dc7cea68b30f405dc60618de17b03d4d46839384f262a792567' 
  AND token = 'MbxKXBLgR2+48dibZCVyCVrbqHKpOpU7iTZSgy6bDz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}