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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0386dde62dc3f4fa06bb0b40c44fe8b05c5e49485264f7310a487de93d89d821' 
  AND token = 'CEp+cJ1IksXGecidU3J+lIBdVck89P7QoWF6SNar6QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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