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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a07e28a9cfdb6d63455b30103a755cfcbc7310f9e9488f66b52302ec604dcc6' 
  AND token = '28b3kWgq83LY22ZcBFYuPYoBsC82T4Kfey3Ow8xRYZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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