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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8de2f059caffe2648cdcf117679c4e18f3dd3e7fc8889c2d2138fe0438e42ef3' 
  AND token = 'N3gzlr+BNyF9JVds3fttRPRrd4zUQk1He67wDrGDO0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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