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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fd986b799de23372e817c1e3420b4fdc19b1316aebd5362f3fd648d9933b960' 
  AND token = 'FSKbsXLjQ8xf5dPe8RZj22hXfp4ilqTG39DuE1QVg3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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