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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c5c4026c00fc5ccf840a472d28d607b3ace4d22ff45c0b3d443d3862b12b99b' 
  AND token = 'KC+y0ZVVKwGVD4MbeVX02n5XPzqkMpAQ09To6LQU6hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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