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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86d3490cc0c10f69d10e51e3c1b0d091c701c3eb8f2f1108e8ce9cafc192dd41' 
  AND token = 'Jx70Ibgdn8Ur9H5EhZ+lKdnPocGIhm/8at9gk2ePk5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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