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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5977daa95ef2abf4cd3fefa833f5ebee9a750876df15d17dcdf8c921dd1482c6' 
  AND token = 'JtnVERWpdxs0ONR9wHIjjF/9P3ootJhFfVez7ZkbtWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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