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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53839ea3132fe4949e3c82f3d4f6d195a9a45c2352be33833d72f58ba5a8abc0' 
  AND token = 'uk3LufkLKUTYww2M2fcz10keEhp+9TR8KGTiEJDrLZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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