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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0e0d9911beb0451404a7f09c5b7efff4546efd48bd0552a5b113f925116fccf' 
  AND token = 'W1MEtpfMVB9ciaUqcef0iSyEb4UhfX750qV0fT8mED8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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