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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8427699805eff8d4b115a653d1036e9ac6860e8d1f2ccaee8600632efe2676e' 
  AND token = '9vmwlv904ioRHjFt4j0Ct/IeD5qbP6EgfFMiWxSnzGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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