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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69191c146e5f9ed1f1277d04b64c7112c177ee179b70b2834cf3cf1a664a143f' 
  AND token = 'mj0CVj+f6leZcimq9WmV8wofbnqSzEG9j3AsO4tEiDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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