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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '968706abb70222bae0e4de83dab577568cde1b6d17622d51cdba2423b89c4f2a' 
  AND token = 'wRXMXAYmgbB2S2O3nKQQaos2x4xyZmhFhcSSHTqldB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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