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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e611b6b057381284348cff96befac0c339c5af6c880eccac9fe7ce0b187003d' 
  AND token = 'ZalLlDXtWBaMEZ/XI3sE0B9hgJeNcGTKz4EiUe3x+Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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