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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c25f263e576300bdec511d7b7c6dc7f4070a0dfc4bb16bc8b9e40cfaa4556cee' 
  AND token = '/ck5bd6E1BJ7QB+nGPI5MxeIAw1dEbC4cG0lODqLPZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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