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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b23a1c09ab8291f91dff6cfc20dfecbf75ad0bb402eacfe557b76d2744e7efb' 
  AND token = 'he/+5XaGSeJs9Qh+lupjseVkGhoRHIgeZyCZcWSHCd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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