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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c73131b0496cf39430ac9f2209a529ed1e4313b693ac5c5063eea4d6875dd8b7' 
  AND token = 'hehJQ0u1NzXr2ULQnV1feFa7EDmClr6NsDTeZfIvwqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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