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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1a8da37898027ed8ed36becd30a1eaf318e47bc13e88813caec39907beefcfb' 
  AND token = 'FlDfiswuFHLnAX6P5WeiaiGAuX9Bek5vw4DPEKut4t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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