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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0829ac8f34962617a408284dd311fdb1ff7d2ebb39ce0bf4b9d103a0a24e3a63' 
  AND token = 'HfuloxtiR4UyrTRCnTaOrT4U67mWUPwXZ/E8kP2xfjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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