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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48b57c9ff54b03aebe6c723e9a58d07704fd83d33a33fdd52a217ce2336c37bc' 
  AND token = '3+fZNLnOPfFqixIpKhksrevnG1A2yTbH4buAGLEsf/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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