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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4161f8d2d4f4829b2fd03ceb2ec242eac2d9e57ff5968f094adb8f1d10bd7c90' 
  AND token = 'y+heE8lxz70G+QeLy2MpZiIQSY1vEpLotNxkaExDSFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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