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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e113749a992f247a7b74f883ee95416680983891c75a90ace9619c29ebc9d21b' 
  AND token = '+okkHFhZ8/zJmUoYePUoA7/iRsWkLlJO0cLCm+AFw9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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