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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19630c5c120870b4216e3248f637ed153f83f5ef424b4c31741eccafc00d193e' 
  AND token = 'VPzOyay9rh4V1tNd0Qy32v8+pQq0Iw+HHQa5YmUo+0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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