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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a8435c846ed4559c2a9d932902bae1ea82708a249647ec68799eee6b5f4afec' 
  AND token = 'h5jvEy6vztSJW77IYvtOohbUVHcYNIhXRB7CLvAnEKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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