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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '160e8742ac03305b36ef7302bc5ad303bfddc8c2afbe42c16e5008ff68bb14c3' 
  AND token = '6INKWlL3fKRcedxleeAYR00ym3jgYqyMfxLqlzxKPug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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