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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c590061d7fa7ae00c211f34b6d09dc389b49387362d6880e9acfcf302a2825dd' 
  AND token = 'HlX7xRsBs3i4o2yS84uzbRxd3ef3oHFipDOvcOrxq1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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