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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16aa0fb320c093107a90cf83f563819264b472f30a389267eea1342332402093' 
  AND token = 'm7JsvNemdtZ7qM306P0p2Sn3+WS2ZgHK7cn/lnaP8eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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