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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eefab194de3eb33eba7439dee074a37771c49c00e9837c64d9c8843ad47c191e' 
  AND token = 'g0BWjWFJHmNSnn3Wnr3WpPqLt8DgJ4rs3C8ea1yHEuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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