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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf8b5d4deaf2b4c1c57ff0fde0cfd88033a1751564c78e7acad411b1f0cb4042' 
  AND token = 'yciMK06mA36i+pF9m0wXHYfIZpnpdbqZJyH+WrKg8/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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