SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3b417ded1c46444f1d6bcac7725905964a9a6aa7f46b0b7b6237fcd1341744a' 
  AND token = 'IBhKGVZ0HGn28oqqT3okLNVedmaFlpbGzZ3kiwxLLPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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