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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df391fb0fd1bbd911c0f0695a1e3486de978e84ca2fe5c9ab21e6f8f7f71f06f' 
  AND token = 'AAkBLUBvndGI2kS953TUAItAQHIqDBLTgB2NM5PZs98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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