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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57863acb29fb6e32f55e31e11763d2cdfdfd64f81e0f071218d6a48a7a6651c8' 
  AND token = 'ItL+4hKKEVWvPQQVxek/1Rtv+fV6/i3xH5qKJ86W82Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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