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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5e7f489a6f56136a1237f2eb15af0bccb550ea80aebbe5d74f5a89914c32bed' 
  AND token = 'wGRw5y5EoGXIC9q2Ik/8vSSvuRaW1HdbH8cgPZYCayo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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