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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '216bacedaa01e1b2bbfb6e17fd0ebdc8a175a1adcce4d66b17361706cbe15bab' 
  AND token = '+yuX3biON4UxGJa3hlor1bMuQcf2JWDkhW/Sm/NzXQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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