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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ca5c054fbbf5251d8c0f4cf924a1684e62da174b42b627f75122902cdab1a54' 
  AND token = 'YMkeK7N611Jgxjyqjw3YVxF5a9JTNwPXlgMTOjynPzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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