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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17c34c25311b298d665ea881034c0c70a877aab42dd93da4d1d5548634b14971' 
  AND token = 'MLz+HAfdV+VTldK9ZaklIj1QFaNg5DoYp13U333pKvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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