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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '885155736302820874600879a22c7bece17e13948e5a8c557ed908c21e59af4c' 
  AND token = 'b2aOQLYTyGO9BkaSyw5OTyOOUYS+fg+yqT3CCKWYvI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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