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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53ebc9b7009b7468e9b8bd0256b59d47f8e569cfd9f0e9028ab950d0ae3af562' 
  AND token = 'irzfYSoqt1FkLpsbCHgugybpcDQiiydyg03Y2OAgy9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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