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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '769fead08c4c0994fc1825d28a3bbdc403b122e708ba2d9f55e4640c16b7d9d7' 
  AND token = 'VE+T+OpckT5gE8YxmIbzjdEsV8GH0MbH9wrfajNPwsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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