SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41da0895471a6bc37aaa288af4ee562d88168ef6a03956f09eaf879a61099653' 
  AND token = 'Oewovyj9sTEGQ5PqfHpmpNxtuI/KYseAi04gAPb+Jh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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