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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77ec5c7d2e1f5f0302f6034bcba8c9f21e9d8c9576dca3a975c433f5a8c3e829' 
  AND token = 'jjFvs94uuOh+mnna0KPcK4q9X00tGhx7KiJovfRrKOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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