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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23b530ec29ee09eabfeeb2559dd15556ab7e57888bac60ff54a8ca975515657a' 
  AND token = 'kKRRhkDtV9YF4eQzW+1IqbcaKBbMeRo2ax+9Xiaw4Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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