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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25b871ddbe214499ab284ed560ba452c2c11451bc4ed78645225cfed8e9dcb75' 
  AND token = 'FVSlqlTWfpDXoSJG2hD5kDr7B6Io+M5AcHHh4NcM3qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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