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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c97915632b644215664f46e4f6cfcbb24b37ed7fb7895af35e07f7b61f9df634' 
  AND token = 'DxCIb8D5EX9J0Ko6Beou9TeBmnY6AVGVDmbWmoqXArU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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