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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3d5e62da600f459c4d7ee5245ba1d829349ae41695fe72cc635da0463608c71' 
  AND token = 'tbwdZVTUe7LZhtPd+tjpyyLUrUJxp605aoy/Q8r5F3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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