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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e479ab9c23882de4f371cc4a3fdd304492eadbc7463f01f8e7718fcb4b78ec13' 
  AND token = 'TKiKeu/Eqzoisfb65SaGicTzwR+ihYJhiUybECXjm80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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