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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b248835d4e40e0508e39a5eef93da7c0372b247db1259c84a19933e8820bffd5' 
  AND token = 'eJ/RFxys9TPC54FzPsdOhYqmgOYYDknBsiKMDwkFfs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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