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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '949d1db04490308c6b8e63666834927116d04f89b0c52c93cf2dfa30a26192cc' 
  AND token = '4PWBniT33yAki0avyCR3n5AAVkAF1ZuSbWIa3KPddso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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