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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '165f92cfc62730baa723aa6d612ac0836f8e8a858c8082ea5e7f9160609c5f55' 
  AND token = 'C1h5lgQP08Nbucrunde+OHr0/9tD8IrAVNA+4WU1BAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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