SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77b71cab7d722630c19245250b958a599bf0859845064dc89d32aaab98576883' 
  AND token = '6/lzKLJOKt7w6Zr7kn2FzlzkY6BEDYMgrHFAB8bUBUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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