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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d6865482c00b6f60be0b0bf191b87d87201c4707cd29e8c2ee10a556ad41269' 
  AND token = 'q5TagwEg01srVSADtlq1MT2tfRDDztZX4H9n0XiNlBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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