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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd47cdae1322a236fcc2bf8f1e0922a4c6b5399575d5b290210dda16c7cfc1d2b' 
  AND token = 'dhliXLo4QjbQdz5b60c9XvrcypQUni/3l0j8WldOwM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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