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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaa43ac37bbc4fba452782cb12ae9d4ccd61e35e54dbac28467f66c57058c5dd' 
  AND token = '5kFUQyUGSug1rQ/IJp424MIYg/0YpUZg/McWxyNi9aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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